Heroes and Generals, a military FPS-MMO, is now accepting players to join the battle between allied and axis forces. You can view the trailer via YouTube and familiarize yourself with the official FAQ.
Here is the scoop:
Heroes & Generals is a Massive Online FPS with a Strategic Multiplayer Campaign, taking place in the European theater of war during WWII. ‘Heroes’ refer to the players engaged in the FPS-part of the game and ‘Generals’ refer to the players managing the resources and commanding Assault Teams (army units) in the Strategy-part of the game.